Sewing-machine attachment



April 28, 1925.

I A. O. THOMAS SEWING MACHINE ATTACHMENT F-iled April 1, 922

A 0. THOA/IAS JNVENTOR.

m4 MW/ A TTORNEY.

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Patented Apr. 28, 1925.

PATENT OFFICE.

ALONZO O. THOMAS, 013 DATIL, NEW MEXICO.

SEWING-MACHINE ATTACHMENT.

Application filed April 1, 1922. Serial No. 548,614.

To aZZ whom it may] concern.

Be it known that I, ALoNzo O. THOMAS, a citizen of the United States,residing at Datil, in the county of Socorro and State of New Mexico,have invented certain new and useful Improvements in Sewing-MachineAttachments; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to an attachment for sewing machines and moreparticularly to a presser foot attachment.

The object of the invention is to provide a presser foot of skeletonstructure which will permit the continuous observation of the workunder. the needle to permit stitching of fancy designs; the lettering ofgarments in stitching; darning, mending, buttonholing and blanketstitch, ruflling and sheering as may be desired.

A further object is to provide a presser foot under a continuous tensionadapted tocontinuously engage the cloth being sewed. Further objectswill appear in the course of the detailed description.

The invention consists in the novel structure, arrangement andcombination of parts as hereinafter more particularly described andclaimed.

One sheet of drawings accompanies this specification as part. thereof,in which like reference characters indicate similar parts throughout.

Figure 1 is an elevational view of the improved device in what may betermed its unwound position;

Fig. 2 is a bottom view of the device as shown in Fig. 1;

Fig. 3 is a perspective elevation of the device in its wound positionready for attachment to the presser bar, same being partly broken awayto show the coiled tension spring;

Fig. 1- shows a"typical presser bar with an ordinary removable presserfoot;

Fig. 5 shows the improved device substitinted for the ordinary presserfoot of Fig.

Fig. 6 shows a modified form of the skeleton foot, and

Fig. 7 is an end elevation of. Fig. 6.

The improved device comprises a skeleton foot member 1 preferably formedfrom wire bent into a loop having its ends 2 inwardly directed to forman axis. The opposite end of the loop 3 is contracted into tworelatively closely spaced side members H between which the needle isadapted to play, which parts l l are preferably bent downwardly into alower plane than that of the loop proper while. the extreme end 3 isturned upwardly so that the lower faces of sides l l and end 3 form arocking surface.

A holding member 7 which may be formed from a piece of sheet metal bentupon itself to form at the fold a hinge part 8 is provided, the bore ofhinge part 8 being sufliciently large to accommodate a coil spring 9 andthe ends 2-2 of foot member 1. One end of spring 9 is secured to foot 1as at 10 and the other end is secured to holder member 7. Theoverlapping parts of holder member 7 may be provided with a laterallyextending slot 11 and an angular attachment member 12 is secured to theupper face of holding member 7 as by bolt 14; and nut 15. The upstandingpart of attachment member 12 is provided with a slot 13 adapted to besecured under thumb screw 18 on presser bar a. A yoke member 16 havingits ends hooked as at 17 and extending beyond the sides of holder member7 is secured under the head of bolt 14 and said hooks 17 are adapted toengage foot member 1 when the device has been removed from the machineto prevent the rotation of foot 1 more than one revolution so to avoidthe unwinding of spring 9. Figs. 1, and 2 illustrate the device thusremoved with hooks 17 engaging foot 1.

lVhen the device is applied, foot 1 is swung around to the positionillustrated in Figs. 3 and 5 in which position coil spring 9 will exerta downward tension upon side parts 4-4: to hold same constantly incontact with the work as well when presser bar a is elevated as when itis depressed. Obviously, however, the tension exerted is less whenpresser bar a is elevated than when it is depressed and this differencein the tension permits the proper movement of the cloth to change itsposition under the needle.

In Figs. 6 and 7 a modified form of presser foot 1 is illustrated inwhich the side parts 4:& are shown bent into transversely extendingloops 5 which are preferably upturned as illustrated in Fig. 7. In thistype of presser foot the needle will operate centrally between loops 5-5and 3 and the work will be held taut under the needle without Ill)liability to wrinkling regardless of the direction in which it may bemoved relatively to the presser foot.

It will be obvious that many changes in detail of construction may bemade in my invention without departing from the spirit thereof asexpressed in the claims. It will be understood that the construction ofmeans for attachment to the presser bar will be changed in each case asrequired by the form of the presser bar in use on the machine to whichthe attachment is to be applied. Likewise such details as the exact termof the stop member, the exact shape ot the presser toot, and otherdetails of construction may be varied without departure from the spiritof the invention or the scope ot the claims.

Having thus fully described my invention. 1 claim:

1. In a device of the character described, a skeleton toot comprising apiece of wire bent upon itse f to form spaced cloth engaging parts andhaving its ends inturned to form a pivotal axis for said foot.

2. In a device of the character described, a skeleton toot consisting ofa wire bent upon itselt to form a plurality of radially disposed clothengaging loops lying in a common plane and having its ends then bentupwardly and then inwardly to form a pivotal mount for said foot.

3. In a device of the character described, a skeleton foot comprising apiece o'ii wire bent upon itself to form spaced cloth engaging parts andhaving its ends in-turned to term a pivotal axis for said foot, andresilient means for exerting a continuous downward pressure on saidfoot.

i. A device of the character described comprising a holding memberprovided with a hinge portion, a skeleton toot provided with inwardlyturned ends pivotally mounted in said hinge portion, and a springsurrounding said ends adapted to normally hold said toot in depressedposition.

5. A device of the character described comprising a holding memberprovided with a hinge portion, a skeleton toot formed with inwardlyturned ends pivotally mounted in said hinge portion, a springsurrounding said ends and attached thereto to normally hold said foot indepressed position, and means for preventing the uncoilingo't saidspring when said foot is detached.

In testimony whereof I afiix my signature.

ALONZO 0. THOl-IAS.

